ColdPruf Men's Fire Retardant Single Layer Bottom 55% Modacrylic, 45% Cotton, Waffle Knit Imported THERMACHOICE SYSTEM: Cold to very cold weather conditions/medium to high activity levels Tag less with Non-binding rib cuffs and comfort waistband True sizing for accurate fit Front and Back Rise and Gussets for Superior Fit and Comfort THERMACHOICE SYSTEM: Cold to very cold weather conditions/medium to high activity levels